Electric toothbrush

摘要

An electric toothbrush capable of suppressing loss of vibration energy while suppressing the vibration of the portion a user grips with hand is provided. In an electric toothbrush including an inner case, made up of an inner case main body and a motor holder, mounted with various components including a motor; an outer case which interiorly accommodates the inner case and which acts as a portion the user grips with hand when brushing teeth; an eccentric shaft, configured by a shaft main body and an eccentric member, which center of gravity is arranged at a position shifted from a shaft center and which rotates by a drive force of the motor; and a vibration transmitting component for transmitting the vibration generated with the rotation of the eccentric shaft to a brush portion; where the vibration transmitting component is positioned with respect to the outer case by point contacting the inner wall surface of the outer case at a plurality of locations.

主权项

1. An electric toothbrush comprising:
an inner case which is mounted with components including a drive source; an outer case which interiorly accommodates the inner case, and which becomes a portion a user grips with hand when brushing teeth; an eccentric shaft which center of gravity is arranged at a position shifted from a shaft center and which rotates by a drive force of the drive source; and a vibration transmitting component which transmits a vibration generated with a rotation of the eccentric shaft to a brush portion, wherein the vibration transmitting component is positioned with respect to the outer case by point contacting an inner wall surface of the outer case at a plurality of locations, and the vibration transmitting component includes, a stem, made from a hard material, arranged with an eccentric shaft bearing; a holder, made from a hard material, arranged so as not to contact the stem and fixed to the inner case; and an elastic member having an interposing portion interposed so as to be sandwiched between the stem and the holder, and a plurality of projecting portions that point contacts the inner wall surface of the outer case.